Finalizing implementation of almost all events for forwarding strategy.
Implementing FwStats strategy that just calculates statistics for
pit entries and incoming/outgoing interests.

A serious testing is necessary to see if everything works.
diff --git a/model/forwarding-strategy/fw-stats.cc b/model/forwarding-strategy/fw-stats.cc
new file mode 100644
index 0000000..1c1c873
--- /dev/null
+++ b/model/forwarding-strategy/fw-stats.cc
@@ -0,0 +1,100 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ *         Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#include "fw-stats.h"
+
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-content-object-header.h"
+#include "ns3/ccnx-pit.h"
+#include "ns3/ccnx-pit-entry.h"
+
+#include "ns3/assert.h"
+#include "ns3/log.h"
+
+#include <boost/foreach.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/lambda/bind.hpp>
+namespace ll = boost::lambda;
+
+NS_LOG_COMPONENT_DEFINE ("NdnSimFwStats");
+
+namespace ns3 {
+namespace ndnSIM {
+
+NS_OBJECT_ENSURE_REGISTERED (FwStats);
+  
+TypeId
+FwStats::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ns3::ndnSIM::FwStats")
+    .SetGroupName ("Ccnx")
+    .SetParent <BestRoute> ()
+    .AddConstructor <FwStats> ()
+    ;
+  return tid;
+}
+    
+FwStats::FwStats ()
+{
+}
+
+void
+FwStats::DidCreatePitEntry (const Ptr<CcnxFace> &incomingFace,
+                            Ptr<CcnxInterestHeader> header,
+                            const Ptr<const Packet> &packet,
+                            Ptr<CcnxPitEntry> pitEntry)
+{
+  super::DidCreatePitEntry (incomingFace, header, packet, pitEntry);
+  
+  m_stats.NewPitEntry (header->GetName ());
+  m_stats.Incoming (header->GetName (), incomingFace);
+}
+
+void
+FwStats::WillSatisfyPendingInterest (const Ptr<CcnxFace> &incomingFace,
+                                     Ptr<CcnxPitEntry> pitEntry)
+{
+  super::WillSatisfyPendingInterest (incomingFace, pitEntry);
+  
+  m_stats.Satisfy (pitEntry->GetPrefix ());  
+}
+
+void
+FwStats::DidSendOutInterest (const Ptr<CcnxFace> &outgoingFace,
+                             Ptr<CcnxInterestHeader> header,
+                             Ptr<CcnxPitEntry> pitEntry)
+{
+  super::DidSendOutInterest (outgoingFace, header, pitEntry);
+
+  m_stats.Outgoing (header->GetName (), outgoingFace);
+}
+
+void
+FwStats::WillErasePendingInterest (Ptr<CcnxPitEntry> pitEntry)
+{
+  super::WillErasePendingInterest (pitEntry);
+
+  m_stats.Timeout (pitEntry->GetPrefix ());
+}
+
+
+} // namespace ndnSIM
+} // namespace ns3